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Talks and Poster Presentations (with Proceedings-Entry):

S. Großeiber, C. Gusenbauer, S. Ilie, E. Kozeschnik, G. Requena:
"Damage initiation during hot deformation of a continuously cast steel";
Talk: iCT 2014, Wels; 02-25-2014 - 02-28-2014; in: "Proceedings of Conference on Industrial Computed Tomography (iCT 2014))", (2014), 139 - 140.



English abstract:
In continuous casting of steel, intergranular transverse crack formation may take place during straightening of the slab. This is mainly owing to mechanical and thermal stresses together with low ductility typically observed in a temperature range within 700 to 1000°C (second ductility minimum) [1-3]. The reduction of area at fracture (RA) determined by means of laboratory hot ductility tests is commonly used to evaluate the crack sensitivity during straightening. A more rigorous method is the investigation of damage formation in broken samples utilizing X-ray computed tomography (XCT) [4-5], see figure 1. However, this approach involves a lack of information on initiation, growth and coalescence of those deformation pores actually leading to final fracture in hot ductility tests. Thus, in this work, samples are quenched at a series of different strains before final fracture. Damage initiation and evolution are investigated utilizing light optical microscopy as well as microfocus and sub-microfocus laboratory XCT. It is demonstrated that the traditional approach using RA may considerably underestimate the crack sensitivity during straightening in the austenite single-phase region.

Created from the Publication Database of the Vienna University of Technology.